Gas burner



Ap 30, 1929.* n. EIcKWbRn-y gAs BURNER Filed June 1, 1925 Patented Apr. '30, 1929.

UNITED STATES REGNIER EICKWOBTH, 0F DORTMUND, GERMANY.

GAS BURNER.

Application filed June 1, 1925, Serial No. 33,942, and in Germany .Tune 3, 1924.

My invention relates to improvements in gas burners, and more particularly in gas burners provided with means in'the form of a propeller operated by the current of gas and taking in the air for supporting combustion and mixing the same with the gas. The object of the improvements is to provide a burner of this type which can be equally used with a supply of poor and rich gas. As is known to those skilled in the art a definite amount of air is required for a given effect of the burner, and the air required for supporting combustion depends on the quality of the gas. Accordingly the amount of gas acting on the propeller is smaller when using T a rich gas than when using a poor gas. How- 1 ever the gas supply to the propeller must always be such that the propeller takes in the same amount of air. Therefore the pressure and the velocity of the gas admitted to the propeller must answer this condition in order to insure satisfactory operation of the gas burner with gas of different qualities. In order to have constant pressure and velocity of the gas I construct the gas supply to the propeller so that the cross-sectional area of the said supply is varied according to the volume of gas flowing therethrough, so that the velocity of the propeller remains constant.

For the purpose of explaining the invention two examples embodying the same have been shown in the accompanying drawing, in

- which the same reference characters have been used in all the views to indicate corresponding parts. In said drawing,,

Fig. 1, is a sectional elevation showing the burner and a part of a steam boiler having the burner connected with its fire tube,

Fig. 2, is a sectional elevation taken on the line 2-2 of Fig. 1 and looking in the direction of the arrows,

Fi gl 3, is a similar section showing the slide controlling the gas passages in the position for reducing the areas of the 'said passages,

Fig. 4, is a detail sectional view on an enlarged scale taken transversely of-the axis of the propeller and showing a modification of the burner in which the gas passages are subdivided into more than two sectional passages, and

Fig. 5, is a development of the burner shown in Fig. 4.

In the example shown in Figs. 1 to 3 the burner is assumed to be connected to the fire tube 6 of asteam boiler 7. As shown the burner comprises an annular casing 8 provided with a gas inlet 9 and open at its front and rear sides. To the front side of the easing 8 an annular member 10 is secured which projects into the casing and towards the fire tube 6, and which is provided circumferentially withalternatingly arranged chambers 11 and 12 12 The chambers 11 are provided for supplying air'to the burner, and they areopen at their front and rear ends. The chambers 12 and 12are divided by a. partition 13, and. they are used for supplying the gas to the burner. for which purpose they communicate through openings 14 with the annular casing 8. Further, the said gas chambers are open at their inner ends. Atthe rear of the chambers 11, 12 12 there'is an annular member 15 provided with guide vanes, said member being connected to or made integral with the annular member 10. At the rear of the member 15 there is a propeller wheel 16 provided with buckets or vanes adapted. to receive the gas from the guide member 15 and to take in by suction air from the chambers 11. The member 16 is made integral with a hub 17, the parts being connected with each other by vanes 18 adapted to take in secondary air through the axial. part of the propeller. The hub 17 is mounted oua shaft 19 rotatable in an antifriction bearing 20 connected with the member 10 by ribs 21.

So far the construction of the burner is known in the art, with exception, however, of the partitions 13 dividing the gas chambers into sectional chambers 12 and 12 Referring now to the novel features of my improved burner, a ring 22 is disposed around the inner portion/of the member 10, which ring is provided with openings 23 the area of which corresponds to the total area of the openings 14 of the gas chambers 12, 12 The said ring 22 is adapted to be shifted circumferentially of the member 10 for covering the sectional chambers 12, as is shown in Fig. 3. Therefore I am enabled to supply the gas either through both sectional chambers 12 and 12 or through the sectional chamber 12 only, the position of the slide 22 I shown in Fig. 2 being used when supplying a p poor gas, and the position of the slide shown in Fig. 3,]1eing used when supplying a rich gas. Therefore the pressure and the velocity of the gas is the same whether a poor or a rich gas is supplied, and accordingly the burner takes in the exact amount of air required for complete combustion. In the example shown in the figures the annular slide 22 is provided with circumferential teeth 24 engaged by a pinion 25 connected with a hand wheel 26. The slide 22 is provided with a pair of lugs 27 cooperating with a stop 28 for arresting the slide in its end positions.

, The operation of the burner is as follows: When supplying poor gas to the burner the slide 22 is set in the position shown in Fig.

2 in which botlrsectional gas chambers 12 and 12 are connected with the gas supply. The gas comingfrom the said gas chambers is deflected by the vanes of the member 15 and after thus being deflected it is thrown against the vanes of the propeller wheel 16 thus rotating the same. Thereby primary air is taken in through the air chambers 11 and secondar the memfier 10 and the vanes 18. l Vhen supplying rich gas to the burner the slide 22 is set into the position shown in Fig. 3-in which the sectional gas chambers 12 are closed. Therefore, notwithstanding the reduced volume of gas the pressure and the velocity of the gas supplied to the propeller wheel 16 remain constant, 'so that the velocity of the said propeller wheel and therefore the volume of air taken in thereby remain the same.

In the modification shown in Figs. 4 and 5 the general construction of the burner is the same as that of the burner described with reference to Figs. 1 to 3, and the same reference characters have been used to indicate corresponding parts. However the gas chambers are subdivided by a'plurality of partitions 13 into more than two sectional chambers 12 Thereby I am enabled to adapt the burner to gas 'of different qualities.

While in describing the invention reference has been made to'two particular .exam les embodying the same I wish it to be an erstood that my invention is not limited to the constructions shown in the drawing, and that various changes may be made in the general arramgement of the apparatus and the construction of its parts without departing from the invention.

I claim:

' 1. A burner for gaseous fuel, comprising a propeller wheel, means for admitting gaseous fuel with said propeller at different spaced points, means acted upon by said propeller wheel for taking in air for supporting combustion, and means at all of said points for varying the fuel supply.

2. A burner for gaseous fuel, comprising a propeller wheel, means for admitting gaseous fuel into the propeller at different and a slide disposed circumferentially of said air through the axial passage of,

a propeller wheel, a member in front of said wheel provided with separate circumferential chambers opening into said wheel and alternately connected respectively with the supply of gaseous fuel and a supply of air, partitions dividing said chambers for the supply of gaseous'fuel into sectional chambers,

so chambers and provided with openings adapted to open one or more of said sectional chambers.

4. A burner for gaseous fuel, comprising a propeller wheel, a member in front of said wheel provided with separate circumferential chambers opening into said wheel and alternatelyconnected respectively with the supply of gaseous fuel and a supply of air, partitions dividing said chambers for the supply of gaseous fuel into sectional chambers, a slide disposed circumferentially of said chambers and provided with openings adapted to open one or more of said sectional chambers, and atoothedgearing connected with said slide for rotating the same.

5. A burner for gaseous fuel, comprising a propeller wheel, parts providing passages to deliver gaseous fuel to said propeller wheel at different spaced points around the periphery, means at all of said points for varying the area of said fuel delivery passages, and means acted upon by said propeller wheel for taking in a irfor supporting combustion.

6. A burner for gaseous fuel, comprising a propeller wheel, a chamber around the propcller wheel, means for supplying said chamber with gaseous fuel, passages leading from said chamber to the propeller wheel at different spaced points around its periphery, a ring for varying the cross sectional area of said fuel delivermg passages, and means acted upon by said propeller wheel for taking in air for supporting combustion. I

7 A burner for gaseous fuel, comprising a propeller wheel, a chamber surrounding the propeller wheel, means for supplying gaseous fuel to said chamber, passages leading from the chamber to the propeller wheel at different spaced points around its periphery, a ring for varying a cross sectional area of said fuel delivering passages, means for operating said ring, and means acted upon by said propeller Wheel for taking in air for supporting combustion. l

8. A burner for gaseous fuel comprising a propeller wheel through which gaseous fuel is supplied, parts for providing passages to deliver gaseous fuel to said wheel at differ nt spaced points around the periphery t1: "eof,

means for simultaneously varying the crossperiphery thereof, a ring for varying the sectional area of all said fuel delivery pascross-sectional area of said passages, and sages, and means acted upon by said propeller means acted upon b said wheel for taking in 10 wheel for takim in air to support Combustion. air to support com ustion;

5 9. A burner ior gaseous fuel comprising a In testimony whereof I hereunto aflix my propeller wheel, parts providing passages'to signature. supply gaseous fuel to the wheel around the REGNIER EICKWORTH. 

